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Contents
module DataMapper
module Validations
##
#
# @author teamon
# @since 0.9
module ValidatesWithBlock
##
# Validate using the given block. The block given needs to return:
# [result::<Boolean>, Error Message::<String>]
#
# @example [Usage]
# require 'dm-validations'
#
# class Page
# include DataMapper::Resource
#
# property :zip_code, String
#
# validates_with_block do
# if @zip_code == "94301"
# true
# else
# [false, "You're in the wrong zip code"]
# end
# end
#
# # A call to valid? will return false and
# # populate the object's errors with "You're in the
# # wrong zip code" unless zip_code == "94301"
#
# # You can also specify field:
#
# validates_with_block :zip_code do
# if @zip_code == "94301"
# true
# else
# [false, "You're in the wrong zip code"]
# end
# end
#
# # it will add returned error message to :zip_code field
#
def validates_with_block(*fields, &block)
@__validates_with_block_count ||= 0
@__validates_with_block_count += 1
# create method and pass it to MethodValidator
raise ArgumentError.new('You need to pass a block to validates_with_block method') unless block_given?
method_name = "__validates_with_block_#{@__validates_with_block_count}".to_sym
define_method(method_name, block)
opts = opts_from_validator_args(fields)
opts[:method] = method_name
add_validator_to_context(opts, fields.empty? ? [method_name] : fields, DataMapper::Validations::MethodValidator)
end
end # module ValidatesWithMethod
end # module Validations
end # module DataMapper
Version data entries
10 entries across 10 versions & 1 rubygems